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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
QM DSP Library
Centre for Digital Music, Queen Mary, University of London.
This file 2005-2006 Christian Landone.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#ifndef MATHUTILITIES_H
#define MATHUTILITIES_H
#include <vector>
#include "nan-inf.h"
class MathUtilities
{
public:
static double round( double x );
static void getFrameMinMax( const double* data, unsigned int len, double* min, double* max );
static double mean( const double* src, unsigned int len );
static double mean( const std::vector<double> &data,
unsigned int start, unsigned int count );
static double sum( const double* src, unsigned int len );
static double median( const double* src, unsigned int len );
static double princarg( double ang );
static double mod( double x, double y);
static void getAlphaNorm(const double *data, unsigned int len, unsigned int alpha, double* ANorm);
static double getAlphaNorm(const std::vector <double> &data, unsigned int alpha );
static void circShift( double* data, int length, int shift);
static int getMax( double* data, unsigned int length, double* max = 0 );
static int getMax( const std::vector<double> &data, double* max = 0 );
static int compareInt(const void * a, const void * b);
enum NormaliseType {
NormaliseNone,
NormaliseUnitSum,
NormaliseUnitMax
};
static void normalise(double *data, int length,
NormaliseType n = NormaliseUnitMax);
static void normalise(std::vector<double> &data,
NormaliseType n = NormaliseUnitMax);
// moving mean threshholding:
static void adaptiveThreshold(std::vector<double> &data);
static bool isPowerOfTwo(int x);
static int nextPowerOfTwo(int x); // e.g. 1300 -> 2048, 2048 -> 2048
static int previousPowerOfTwo(int x); // e.g. 1300 -> 1024, 2048 -> 2048
static int nearestPowerOfTwo(int x); // e.g. 1300 -> 1024, 1700 -> 2048
};
#endif
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